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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bc5542e3da00e09da58cb59e08de09f11bfd291eea83febf467884d2ce50b3' 
  AND token = 'i4cniphM3z3SZ2vuAd13y1R9gFKPorTibzjNWE9310w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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