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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5137cbadffe6c2d2b9bfcbfa26d75573494076eea7a154395e049966fa321ce6' 
  AND token = '16mWQAn6Ck9lb/CX6iTIZdSCXaEjXJXXBzzGSd2/mIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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