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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e62745cf729df38b4db9f8c7c590aa8f6701564c6d755cf95ec262388a2334' 
  AND token = 'pNo7Lx0KWXotwoLTVPeMuzMxu92IJ1yVQ12cYbpIyps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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