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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a011195df1895daef12499c8a4ca59c624485f46e32d35272107a21721f502f2' 
  AND token = 'BkbmEUUeg4L38TJfLmH9QQqb8t99/cENPq6gyuxMaL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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