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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c543d36668f63bb1a5bb841b15dde05b22dc8c904771a1202336369e1ccd481' 
  AND token = 'F3sZCybw10fVAQAC12iJilFBgQ+gPPPLTxXbQHGteDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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