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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7907bce37a6f0b25e977c658d4030c20f4fa2bfac1d28b008f4b8d0d547e22' 
  AND token = 'us0f2/hehHwpkUsE1N6+s9sQfgW+gIG/8i6r0vdzb4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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