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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0acb5428696a239e3b28f5f2d2a6e179a2cde86b0fea36d1d27353ce250416fa' 
  AND token = 'k8Qjm4m4+ypv2rzhqUJ1Z+8vvM0C8JN26TmjsSrptXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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