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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97e8f33dec345f042ede83433b0148946a1145a7717f12223137758eefe0d7d' 
  AND token = 'wBj15VduRfQ4ZFYQgjaWlnGE7T7vZ8nlzdufK6bySN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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