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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9250f90534a05b44797f310d0ec77283773fda9af041e2f61c8c8710e70ae9a3' 
  AND token = 'G3E8ISyDXWhf7ABkTaUIPA7GFkarPsPQgXHRkD8mFu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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