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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d906c6cb8d6c50c92762cb500f5db14d94a75268d088206b0606725375fcc3' 
  AND token = 'MKEt5s6BMmB4BE3UN98caRakhlvxxOEylFjZGBjsXgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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