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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fbf7655a04f886b63c46ec627b05e23561c5f5c6856dc2f0f7cbc23b6d78575' 
  AND token = 'ZClBMuTdFQM6f3SXOKatOef3uJgkiowml1xLNcZkTCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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