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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11724189630de9369bfd7c386c30c24a610051818ba23cd28ce2b19bc8852746' 
  AND token = 'kxM6c8C5DYBrE1AvXOc2yXtkyyjtrVJPqGLG79KPIRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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