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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16cf5bd3771098bf76bcd3bddc6ed4b4b936e5d8ad310b94fe6fa5a27adf619' 
  AND token = '5L2DHXyO6QlgTKMLG2CKcuXPJP6BFtTstaLcMsxlfkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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