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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e5ef16a3ac77f7413a4bacf63e19b65d99e7ea4db4e25007c255a895d9baab' 
  AND token = 'U2uFWJkn0caDnyzK4ymunlwSFTCTh72Xe88w5k74kVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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