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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb3a91f89997f70a64618b6d2a0dac1dcce8a8b5bedbc897f1bf8192ffb0908' 
  AND token = 'ycgHndYt5q3H7KtJcIIbM7wShTSlO81q3G0/y8Yyc8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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