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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6233ce4577f21786dfd40724a9249d99439b3ca86dc3dae1c618d580b9d045ad' 
  AND token = 'XT/PIE+4rXtyzu8s9PJ2DftwYfFnSMV+Bfja2a1ha9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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