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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c10ac160b1c5398faa1d80ca57b079c1d870b7f74736da031f91d353f326b1a' 
  AND token = '5sTCR3F4qkGCbuzlAtjUvwmurjiuiONTK6J+1cQNHBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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