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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef59fdb7905be3a7da4077bf032753f02387f687cc98b3d98d219cda9432e33' 
  AND token = '88YsB7DinNdEoyghGwkOtAbL3Wsto/XsZGfE7upF9p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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