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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7720053c0e0206416a05d1938696bfd2aeb669c044e06dadec5a05893fa96c83' 
  AND token = 'o09f4gGIyMKhYmcwbIYKm772Tlw9I13juqOVPGp6Pxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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