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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db66b16ae789e00c38480ba29138723ada30a169f1da7c417ce458390bbde1d' 
  AND token = 'YZZ0IlbXovkaAksBENp0wcwu0bQ0FZSzkd/u28x92p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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