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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae4b852f110d26970523b02a62206c9d3b8ce2ae62e5b679a1d4d35eeea159d' 
  AND token = 'n4qM6nCoj6pED9NeNm/JFVEYjT+vMISoD+vNQhwg8xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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