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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c969facb90d18510925d495d0ec143e22b9de3c6efd5447e4310d1957945aee' 
  AND token = 'cI+CE9pOJQ5+CtvEZ9NY4fxAXZcLR9Bo6Xy9bnHCC0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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