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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6913d73a23b586ebcc2057cfd71b20e119499d19657020e83d0ab92fb79af012' 
  AND token = 'h0XEO2pCCtp07ylDLYwQYHDFDT8jxTIDcoA7Nde5sO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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