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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1addfef6092d96a57120bcbe49d0ca9768971e2e0608eb7739f476db8eeab6' 
  AND token = 'ZPcRpKdXoOOr2/uGPyPpArkCm4BvJQ5hfrohkgYWBEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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