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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fec9c5aca4ff5fedb736703b5de7fe7954aa410ca6aff8e6eed3e97d411bde6' 
  AND token = 'hjMfe+R9N+aAcZyANVbVhb4E58xKdJNSI3MT+ujeOnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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