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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '715a9d6534464464daa6a45ad7e801d02460b48e628ae50e593c26dc27bc248e' 
  AND token = 'ROHW0r0fCfxgvXtNhk8Zl+Pg3HAD12ai38Rc2H5D7xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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