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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e581181234a35dc15b9d9ac6d1f406709a31723fe390feca1829a9562c6610f7' 
  AND token = 'EvXXNbIAIkdoCo3NrdUL+m1emBR387QEHZ6iMwvhYyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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