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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927a063fa83d0ae9a8cafb43aca7cf30f7c232083690c1a25e7bc03d8e1fc28e' 
  AND token = '2cJ+5PqsPHKLcI68yZCecaUj/QuQFC04gBxUvgptsog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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