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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e11c3aa2bf003b11099d29e02ab69c9d8fdbfc6e22f4cb2843dac7c0e1a9af3' 
  AND token = '+2E2h6UYHIs+Jdlph+uBs1w1vIiKTahrwPsKmvCTehQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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