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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7235d8ca7ff8d438df99d9689c71b7bc0e803603b23f8533e86906905721909' 
  AND token = 'ONBvwvbJLOy0hM8SpyYLW+e00YbHrt4263F2Mb+fDsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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