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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c55e8e448b7d77e8a41abc56bb4be050fd7cbe4eb8a8ed38e21cf3592e3e31' 
  AND token = 'VUb+iDx3DSBigaoM7z33M0faaaGVMWJdacWf+Bq4px8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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