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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc10667b3e32a48a8cd6a2bc395a0e9821cd87618d33dc7268c0ee235ead7859' 
  AND token = '4q0rFMF9mLAXJJznwlKHwwQKOY5wbMcD/tTcHq32z/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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