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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ef07c29315b6980cb2e8d8c4e094e1685b177a7db8727722657f22938ceac5' 
  AND token = 'c9tF6m+Uf8Nnk0F7rlSVPgtuDNFJZ4oelYXlPutQaBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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