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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be30e7e721fca104d080a300b5dca8d7147ff47d071a6469d96c8ef3b0a833ce' 
  AND token = 'T9Wwo0PV00Z7aBNnWG/EK5S0k4hrnnh8hn5yEEt0CSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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