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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f992ea088821364f0fdad21dc44b396162ec3ddb1d5aa0b2495c153137d84ee7' 
  AND token = 'qypOKofL616dfpNl1i8VYrQW/8IZDntfUe+eh1V+QeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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