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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a99fb39598029431f6bdc468140872705956613e53e4969eb6d89153c8877b' 
  AND token = 'gSwiXqX4wm6WxDg/soBCp4iJ/g/PVXR/pMIoOe2/yNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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