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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5127e89709ac1f2ee90eaea9d2563aa2b982b83e4cbd9738a26bd44c560a5c' 
  AND token = 'I9vJadiv4XtgM0pHrdodPjVG7bR5/I/ghD21FGUvE74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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