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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f594b6d07deaf36e6adef8f0e82d4147e3f45b4d29afdc2a5fc2db18c8e0392' 
  AND token = 'kb7smr479oiy9kWb+GreMuRHAg6VeSZlxChoa1sYxxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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