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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3b92f307c1f83ddb18a7e8f2dd491f48b892419279dec41aba81b722287dfa' 
  AND token = 'OB1sFNW9SoouGWS3fNfc3TVvGjgsIfwjLMuVw/jX0Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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