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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3add18273cbca3609eea67de7adbd09d06b7aeeaade8f5139be00418062db9' 
  AND token = 'lXE71Q2FtzKR8kWw1qIHogsxylZ2TOkzLKm3q252740=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}