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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80f9594d2f3d7352605d29d2af4d3a5cb975910b6b0f974ca29cda993905497c' 
  AND token = '4Gi5w7Cj3URikKFI72LhTC3TmGfQ/HbMx7K5k3g17JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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