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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14029c15554152e4e28ec742a81666d6aae1d24b4029fd408e20e96e25a81f20' 
  AND token = 'MQ+mm3oFgqzKiM8VaYV2C13YE7XnwhMPgPehPFnhv/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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