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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49f80a5e85dba00d5004b93564bacb82ed663084dc9b70c067030c7372fa2dc8' 
  AND token = '1sPhl2E3MtukLeNK/N7NdR2q9woDNmz1f9cqP3C5t7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00158

JSON explain

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