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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd7bde69c0a9afd9edc40ff3d7077f5b76b0ce29eed35ef0d9481ab82bd2df8' 
  AND token = 'COs3UVwlFUjqSNQI+B7/5xQwB6K00+8T4Miv8LgrbyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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