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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5040872e6bb54ec1f737ded51a7d2508fdadfda5c1be4eeeb0381959c6b213' 
  AND token = 'bB8xtyEBlyPhR1nY/Og9DR09jfH4g+UTrRNmXsjwmdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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