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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d15d47225002162ee14c470fa0d67db746aa358b89654fd4090ac815e33c075' 
  AND token = 'oG2daVroTbb8ix3rT5J0RPD2Z+1PQi8LO5CXnPRtWeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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