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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec30bd5e1567ed7e005c1b2ef4e050e64ce61976e1e5b2f68fdd057de7ad7f7c' 
  AND token = 'j/8RcSqI1vQ2IR3NMah48TMSP4qsDndzsoJmMGNvCEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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