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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2cb18f9649f22a1ae9a8fe435a8d8186b1ff86c59a1d4ea9ef33b05038b7de1' 
  AND token = 'Pi522FrbgljASP8Lo9XKQP9XTbBHxLRPz6j/Z4lm6cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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