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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5bd4ab7fded1e5e61ea958939908791c9717c654d57536c6d21d30823b90ba' 
  AND token = '+Xc6NhHsDbzMkeFvFHMw+1usXjAp9V0Z2rICKn//1hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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