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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52bd0afdae019bdb191c5800660ae490483bcb64321b2ef9330865a4a6389b9' 
  AND token = 'mkD4xCPzZdrsVB6XUT76RxjBevMBfWvwobYEQ15MRFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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