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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e77c872fe49d1414151f4881edb72139abfb896d577124e08ce4c35da6ca0b3' 
  AND token = 'OeRmoyB5pOtqkvxBNggp8W3cZyOcW1r6iZW7V9z1ofk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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