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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e374152fd4973e060429a55f6c97c4e7d6976110aff0d25474d35ca472f6ea' 
  AND token = 'dimdfVVJKGtu6DrPEUIHW8k3qcJXrJMh4CT/6a1jPiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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