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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a176c13811c2e139772c3547010175120e95fb83800069007665b93b80944a2a' 
  AND token = 'PjrjWg5Fy6C5DhaxzphYul2pvtBAHB8o82fiomzNOnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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