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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062a46632c76905b551a875594c43bb37417baff5a06f2b1f211f08a34125c9d' 
  AND token = 'Ho1KfyKfq+mVhZkcR62crXm0mOPMiOhyPpKfMemLUHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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