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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e217d23e49bcaca14e3074fd8af950ae5e5867a9700eaf04ddcf87f5eeb1e3b6' 
  AND token = 'kn3YUHdIwVHK2aU33sJ/Dfu82chgBL76zHEVXrKVT2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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