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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86586887a8454b556cf1260b388610eb4b8f28c599141453c77466f1baf144b8' 
  AND token = 'anHLBsJ3iTX32ILeO3KDzaBMix27uvKkTa9OHxNx90k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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